This has been asked for since virtually the beginning of Youview & it's not happened yet so minimal chance for it in the future.
The only option for the programmes/events that run over or are likely to run over is to record the following programme.
Essential for anything on Eurosport!
Especially if the programme you are interested in follows live tennis in which case best to pad by an hour or two *and* also record another showing as well in case they do their oft used trick of just crashing into the middle of the following programme so as to get the schedule back on track!
A bit of a bug bear this is of mine.
Everyone talks about padding like its the Holy Grail of TV, but it isn't. I had padding on BT Vision and believe me its far from perfect and is in itself inhererently flawed.